Abstract
We report the results of studies of the magnetic and transport properties of Fe49Rh51 alloy prepared by different sequences of quenching and the annealing process. The temperature dependences of the relative initial magnetic permeability and resistivity are analyzed. An optimal regime consisting of annealing at 1300 K for 440 min and quenching from 1300 K to 275 K is found to observe the desired narrow antiferromagnetic–ferromagnetic transition in Fe49Rh51 alloy under cyclic conditions. This has the potential to increase the efficiency of cooling devices based on the magnetocaloric effect of magnetic materials with a first-order field-induced phase transition.
Highlights
Despite the giant values of the magnetocaloric and elastocaloric effects in these alloys, they cannot be regarded as promising prospects for use in magnetic cooling due to the reduction of the magnetocaloric effect in cyclic magnetic fields as well as due to the existence of thermal hysteresis [5,9]
Future challenges in studies of Fe–Rh alloys may involve searching for methods to increase their stability in cyclic magnetic fields in order to decrease the thermal hysteresis of transition
This work is aimed to define the optimal protocol for the thermal treatment of Fe–Rh alloys to reach a decrease in both thermal hysteresis width and transition temperature range
Summary
Fe–Rh alloys exhibit anomalies of magnetic [4,6], thermal [7,8,9], and transport [6,9,10] properties around the temperature of magnetostructural transition. Despite the giant values of the magnetocaloric and elastocaloric effects in these alloys, they cannot be regarded as promising prospects for use in magnetic cooling due to the reduction of the magnetocaloric effect in cyclic magnetic fields as well as due to the existence of thermal hysteresis [5,9]. Future challenges in studies of Fe–Rh alloys may involve searching for methods to increase their stability in cyclic magnetic fields in order to decrease the thermal hysteresis of transition. Among the different methods employed to control magnetic properties, and one of the simplest and most commonly used, is heat treatment [11]
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